Table 3 Regression coefficient (β) and adjusted coefficient of determination (adj. R2) of the predicted second-order model for the response variables.

From: Optimization of enzymatic hydrolysis by alcalase and flavourzyme to enhance the antioxidant properties of jasmine rice bran protein hydrolysate

Responses

Regression coefficients (β)

DH

Protein

3–5 kDa

 < 3 kDa

DPPH

ABTS

FRAP

Constant

X0

9.61

41.43

405.57

287.67

5.44

1.12

793.24

Linear

X1

− 0.83

0.48

15.96

18.15

− 0.04

1.78 × 10–3

18.05

X2

2.47

− 0.03

0.06

− 0.08

0.02

− 8.52 × 10–4

− 1.30

Quadratic

\({\mathrm{X}}_{1}^{2}\)

0.03

− 0.02

− 0.65

− 0.86

–

–

− 1.15

\({\mathrm{X}}_{2}^{2}\)

− 0.16

4.41 × 10–5

–

1.32 × 10–4

− 3.51 × 10–5

1.74 × 10–4

1.47 × 10–3

Interaction

X12

–

–

− 0.02

− 0.01

–

–

–

Adj. R2

0.9629

0.8742

0.6870

0.8642

0.6311

0.7585

0.8981

F-value

78.76

21.84

7.58

16.28

7.84

13.56

27.45

P-value

 < 0.0001

0.0002

0.0079

0.0010

0.0070

0.0011

0.0001

Lack of fit

0.5696

0.5142

0.2716

0.1394

0.2368

0.7565

0.5998

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